K
Khurram Waheed
Researcher at Freescale Semiconductor
Publications - 109
Citations - 1974
Khurram Waheed is an academic researcher from Freescale Semiconductor. The author has contributed to research in topics: Phase-locked loop & Signal. The author has an hindex of 25, co-authored 108 publications receiving 1959 citations. Previous affiliations of Khurram Waheed include Delft University of Technology & NXP Semiconductors.
Papers
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Patent
Linearization of a transmit amplifier
TL;DR: In this paper, a pre-distortion look up table (LUT) stores measured distortion compensation data that is applied to the TX data before being input to the digital to frequency converter (DFC), DPA and PA.
Patent
Digital phase locked loop with dithering
TL;DR: In this paper, a phase-locked loop is used to detect phase difference between the reference clock and the RF clock, and a dithering circuit is coupled to the reference signal in order to overcome quantization noise and thereby improve RMS phase-error detection for integer channels.
Patent
Digital Phase Locked Loop with Integer Channel Mitigation
TL;DR: In this paper, a phase-locked loop that operates on clock signals derived from an RF clock signal generated by the phase locked loop is presented. But the phase detection circuit is coupled to the switch and is operable to receive a selected phase and to provide digital phase error samples indicative of a time difference between the reference clock and the selected phase.
Journal ArticleDOI
Spur-Free Multirate All-Digital PLL for Mobile Phones in 65 nm CMOS
TL;DR: A new multirate architecture of an all-digital PLL (ADPLL) featuring phase/frequency modulation capability and an arbitrarily high data rate modulation that is independent from the reference frequency is proposed.
Proceedings ArticleDOI
A 24mm 2 Quad-Band Single-Chip GSM Radio with Transmitter Calibration in 90nm Digital CMOS
Robert Bogdan Staszewski,D. Leipold,Oren Eliezer,Manouchehr Entezari,Khurram Muhammad,Imran Bashir,Chih-Ming Hung,John Wallberg,Robert B. Staszewski,P. Cruise,Sameh S. Rezeq,Sudheer Vemulapalli,Khurram Waheed,N. Barton,Meng-Chang Lee,C. Fernando,Kenneth J. Maggio,T. Jung,Imtinan Elahi,S. Larson,T. Murphy,Gennady Feygin,I. Deng,T. Mayhugh,Yo-Chuol Ho,Kah Mun Low,C. Lin,J. Jaehnig,J. Kerr,Jaimin Mehta,S. Glock,T. Almholt,Sumeer Bhatara +32 more
TL;DR: The RF transceiver is built on the Digital RF Processor (DRP) technology, and the ADPLL-based transmitter uses a polar architecture with all-digital PM-FM and AM paths.